# Pendulum Lab

1. Nov 25, 2007

### petern

I did a pendulum lab and determined that length affected the period. So the values got where:

10 cm = 6.47 s
15 cm = 7.895 s
20 cm = 8.94 s
25 cm = 9.89 s
30 cm = 10.5 s
35 cm = 11.905 s

With these values, it seems like graphing this straight as it is results in a linear line, but I searched around and found that others did period^2 vs. length.

What should I do?

2. Nov 25, 2007

### rock.freak667

well the equation for the period of a pendulum is given by
$$T=2\pi\sqrt{\frac{l}{g}}$$

so can plot T^2 vs. l or plot T vs.sqrt{l} and you'll get it

3. Nov 25, 2007

### petern

Which equation should I use to describe the T^2 graph. My friend said it includes length, acceleration, and radius.

4. Nov 25, 2007

### rock.freak667

Well both are the same...if you plot T^2 vs. l the gradient of that graph would be [itex]\frac{4\pi^2}{g}[/tex] and you can find g from there

5. Nov 25, 2007

### I-Need-Help!!

Hey plz help me out here ...i m in grade 11 and i got this assignmnt ..where i have to design a car that will move forward from a suspended mass...i hav no idea wot to do ... itz due this frdayplzz i really need help...none of my grou members are helping me out ..

6. Nov 25, 2007

### petern

He said it was l=a/r since the T^2 graph is linear and the slope of that graph is the acceleration, is he right?

7. Nov 25, 2007

### rock.freak667

8. Nov 25, 2007

### rock.freak667

The experiment would usually follow for the equation i typed

9. Nov 25, 2007

### I-Need-Help!!

wot do u mean...i m new.i dunoo how to make a mnew thread!!!

10. Nov 25, 2007

### rock.freak667

11. Nov 25, 2007

### I-Need-Help!!

ohh thanx..i did ...do u think sumone will help me out??

12. Nov 25, 2007

### rock.freak667

If you show what ideas you have...yes

13. Nov 25, 2007

### I-Need-Help!!

can u help me out???..i hav dis idea..

14. Nov 25, 2007